What waveform corresponds with Cardiac Diastole in the cardiac cycle?

In the cardiac cycle, the T-wave represents the phase of cardiac diastole. During this phase, the ventricles are in a relaxed state following depolarization and contraction. The T-wave signifies the repolarization of the ventricular myocardium, which occurs after the heart has pumped blood out during systole. As the ventricles repolarize, they prepare for the next filling phase (diastole).

Understanding the relationship between these electrical activities and the mechanical actions of the heart is crucial. The P-wave corresponds to atrial depolarization, which occurs during the initial filling phase of the heart. The QRS complex represents ventricular depolarization and is associated with the contraction of the ventricles, marking the systolic phase. The U-wave is less commonly discussed and typically represents events related to repolarization, but its significance is not as well-defined in standard clinical practice.

Thus, the T-wave is the correct choice as it reflects the end of ventricular contraction and the beginning of diastole where the heart muscle is in a relaxed state, allowing for filling with blood.